c9-2.cpp

这我们老师对是面向对象程序设计（清华大学出版社）一书制作的PPT

#include <iostream>
using namespace std;
class Box
 {public:
   Box(int,int,int);
   int volume();
  private:
   int height;
   int width;
   int length;
 };
Box::Box(int h,int w,int len)
 {height=h;
  width=w;
  length=len;
 }

int Box::volume()
 {return(height*width*length);
 }
 
    
int main()
 {
  Box box1(12,25,30);
  cout<<"The volume of box1 is "<<box1.volume()<<endl;
  Box box2(15,30,21);
  cout<<"The volume of box2 is "<<box2.volume()<<endl;
  return 0;
 }